Cosmetic: Add macros for NaN, undefined and Infinity to native js code.

src/i18n.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 272 matching lines @@
     configurable: true
   });
 }
 
 
 /**
  * Returns an intersection of locales and service supported locales.
  * Parameter locales is treated as a priority list.
  */
 function supportedLocalesOf(service, locales, options) {
-  if (service.match(GetServiceRE()) === null) {
+  if (IS_NULL(service.match(GetServiceRE()))) {
     throw new $Error('Internal error, wrong service type: ' + service);
   }
 
   // Provide defaults if matcher was not specified.
   if (options === undefined) {
     options = {};
   } else {
     options = toObject(options);
   }
 
@@ skipping 136 matching lines @@
 
   return resolved;
 }
 
 
 /**
  * Returns best matched supported locale and extension info using basic
  * lookup algorithm.
  */
 function lookupMatcher(service, requestedLocales) {
-  if (service.match(GetServiceRE()) === null) {
+  if (IS_NULL(service.match(GetServiceRE()))) {
     throw new $Error('Internal error, wrong service type: ' + service);
   }
 
   // Cache these, they don't ever change per service.
   if (AVAILABLE_LOCALES[service] === undefined) {
     AVAILABLE_LOCALES[service] = getAvailableLocalesOf(service);
   }
 
   for (var i = 0; i < requestedLocales.length; ++i) {
     // Remove all extensions.
     var locale = requestedLocales[i].replace(GetAnyExtensionRE(), '');
     do {
       if (AVAILABLE_LOCALES[service][locale] !== undefined) {
         // Return the resolved locale and extension.
         var extensionMatch = requestedLocales[i].match(GetUnicodeExtensionRE());
-        var extension = (extensionMatch === null) ? '' : extensionMatch[0];
+        var extension = IS_NULL(extensionMatch) ? '' : extensionMatch[0];
         return {'locale': locale, 'extension': extension, 'position': i};
       }
       // Truncate locale if possible.
       var pos = locale.lastIndexOf('-');
       if (pos === -1) {
         break;
       }
       locale = locale.substring(0, pos);
     } while (true);
   }
@@ skipping 51 matching lines @@
   }
 
   return extensionMap;
 }
 
 
 /**
  * Converts parameter to an Object if possible.
  */
 function toObject(value) {
-  if (value === undefined || value === null) {
+  if (IS_NULL_OR_UNDEFINED(value)) {
     throw new $TypeError('Value cannot be converted to an Object.');
   }
 
   return $Object(value);
 }
 
 
 /**
  * Populates internalOptions object with boolean key-value pairs
  * from extensionMap and options.
@@ skipping 177 matching lines @@
 function toTitleCaseWord(word) {
   return word.substr(0, 1).toUpperCase() + word.substr(1).toLowerCase();
 }
 
 /**
  * Canonicalizes the language tag, or throws in case the tag is invalid.
  */
 function canonicalizeLanguageTag(localeID) {
   // null is typeof 'object' so we have to do extra check.
   if (typeof localeID !== 'string' && typeof localeID !== 'object' ||
-      localeID === null) {
+      IS_NULL(localeID)) {
     throw new $TypeError('Language ID should be string or object.');
   }
 
   var localeString = $String(localeID);
 
   if (isValidLanguageTag(localeString) === false) {
     throw new $RangeError('Invalid language tag: ' + localeString);
   }
 
   // This call will strip -kn but not -kn-true extensions.
@@ skipping 695 matching lines @@
 
   match = ldmlString.match(/z|zzzz/g);
   options = appendToDateTimeObject(
       options, 'timeZoneName', match, {z: 'short', zzzz: 'long'});
 
   return options;
 }
 
 
 function appendToDateTimeObject(options, option, match, pairs) {
-  if (match === null) {
+  if (IS_NULL(match)) {
     if (!options.hasOwnProperty(option)) {
       defineWEProperty(options, option, undefined);
     }
     return options;
   }
 
   var property = match[0];
   defineWEProperty(options, option, pairs[property]);
 
   return options;
@@ skipping 281 matching lines @@
   // Special case handling (UTC, GMT).
   var upperID = tzID.toUpperCase();
   if (upperID === 'UTC' || upperID === 'GMT' ||
       upperID === 'ETC/UTC' || upperID === 'ETC/GMT') {
     return 'UTC';
   }
 
   // We expect only _ and / beside ASCII letters.
   // All inputs should conform to Area/Location from now on.
   var match = GetTimezoneNameCheckRE().exec(tzID);
-  if (match === null) {
+  if (IS_NULL(match)) {
     throw new $RangeError('Expected Area/Location for time zone, got ' + tzID);
   }
 
   var result = toTitleCaseWord(match[1]) + '/' + toTitleCaseWord(match[2]);
   var i = 3;
   while (match[i] !== undefined && i < match.length) {
     result = result + '_' + toTitleCaseWord(match[i]);
     i++;
   }
 
@@ skipping 199 matching lines @@
 /**
  * Compares this and that, and returns less than 0, 0 or greater than 0 value.
  * Overrides the built-in method.
  */
 $Object.defineProperty($String.prototype, 'localeCompare', {
   value: function(that) {
     if (%_IsConstructCall()) {
       throw new $TypeError(ORDINARY_FUNCTION_CALLED_AS_CONSTRUCTOR);
     }
 
-    if (this === undefined || this === null) {
+    if (IS_NULL_OR_UNDEFINED(this)) {
       throw new $TypeError('Method invoked on undefined or null value.');
     }
 
     var locales = %_Arguments(1);
     var options = %_Arguments(2);
     var collator = cachedOrNewService('collator', locales, options);
     return compare(collator, this, that);
   },
   writable: true,
   configurable: true,
@@ skipping 122 matching lines @@
   writable: true,
   configurable: true,
   enumerable: false
 });
 %FunctionSetName($Date.prototype.toLocaleTimeString, 'toLocaleTimeString');
 %FunctionRemovePrototype($Date.prototype.toLocaleTimeString);
 %SetNativeFlag($Date.prototype.toLocaleTimeString);
 
 return Intl;
 }())});